#!/bin/bash
# Copyright (C) 2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

. /lib/lsb/init-functions

: ${vyatta_env:=/etc/default/vyatta}
source $vyatta_env

declare progname=${0##*/}
declare action=$1; shift

declare -x BOOTFILE=$vyatta_sysconfdir/config/config.boot

# If vyos-config= boot option is present, use that file instead
for x in $(cat /proc/cmdline); do
    [[ $x = vyos-config=* ]] || continue
    VYOS_CONFIG="${x#vyos-config=}"
done

if [ ! -z "$VYOS_CONFIG" ]; then
    if [ -r "$VYOS_CONFIG" ]; then
        echo "Config selected manually: $VYOS_CONFIG"
        declare -x BOOTFILE="$VYOS_CONFIG"
    else
        echo "WARNING: Could not read selected config file, using default!"
    fi
fi

declare -a subinit
declare -a all_subinits=( firewall )

if [ $# -gt 0 ] ; then
    for s in $@ ; do
        [ -x ${vyatta_sbindir}/${s}.init ] && subinit[${#subinit}]=$s
    done
else
    for s in ${all_subinits[@]} ; do
        [ -x ${vyatta_sbindir}/${s}.init ] && subinit[${#subinit}]=$s
    done
fi

GROUP=vyattacfg

# easy way to make empty file without any command
empty()
{
    >$1
}

# check if bootup of this portion is disabled
disabled () {
    grep -q -w no-vyos-$1 /proc/cmdline
}

# if necessary, provide initial config
init_bootfile () {
    if [ ! -r $BOOTFILE ] ; then
        if [ -f $vyatta_sysconfdir/config.boot.default ]; then
            cp $vyatta_sysconfdir/config.boot.default $BOOTFILE
        else
            $vyos_libexec_dir/system-versions-foot.py > $BOOTFILE
        fi
        chgrp ${GROUP} $BOOTFILE
        chmod 660 $BOOTFILE
    fi
}

# if necessary, migrate initial config
migrate_bootfile ()
{
    if [ -x $vyos_libexec_dir/run-config-migration.py ]; then
        log_progress_msg migrate
        sg ${GROUP} -c "$vyos_libexec_dir/run-config-migration.py $BOOTFILE"
    fi
}

# load the initial config
load_bootfile ()
{
    log_progress_msg configure
    (
        if [ -f /etc/default/vyatta-load-boot ]; then
            # build-specific environment for boot-time config loading
            source /etc/default/vyatta-load-boot
        fi
        if [ -x $vyos_libexec_dir/vyos-boot-config-loader.py ]; then
            sg ${GROUP} -c "$vyos_libexec_dir/vyos-boot-config-loader.py $BOOTFILE"
        fi
    )
}

# restore if missing pre-config script
restore_if_missing_preconfig_script ()
{
    if [ ! -x ${vyatta_sysconfdir}/config/scripts/vyos-preconfig-bootup.script ]; then
        mkdir -p ${vyatta_sysconfdir}/config/scripts
        chgrp ${GROUP} ${vyatta_sysconfdir}/config/scripts
        chmod 775 ${vyatta_sysconfdir}/config/scripts
        cp ${vyos_rootfs_dir}/opt/vyatta/etc/config/scripts/vyos-preconfig-bootup.script ${vyatta_sysconfdir}/config/scripts/
        chgrp ${GROUP} ${vyatta_sysconfdir}/config/scripts/vyos-preconfig-bootup.script
        chmod 750 ${vyatta_sysconfdir}/config/scripts/vyos-preconfig-bootup.script
    fi
}

# execute the pre-config script
run_preconfig_script ()
{
    if [ -x $vyatta_sysconfdir/config/scripts/vyos-preconfig-bootup.script ]; then
        $vyatta_sysconfdir/config/scripts/vyos-preconfig-bootup.script
    fi
}

# restore if missing post-config script
restore_if_missing_postconfig_script ()
{
    if [ ! -x ${vyatta_sysconfdir}/config/scripts/vyos-postconfig-bootup.script ]; then
        mkdir -p ${vyatta_sysconfdir}/config/scripts
        chgrp ${GROUP} ${vyatta_sysconfdir}/config/scripts
        chmod 775 ${vyatta_sysconfdir}/config/scripts
        cp ${vyos_rootfs_dir}/opt/vyatta/etc/config/scripts/vyos-postconfig-bootup.script ${vyatta_sysconfdir}/config/scripts/
        chgrp ${GROUP} ${vyatta_sysconfdir}/config/scripts/vyos-postconfig-bootup.script
        chmod 750 ${vyatta_sysconfdir}/config/scripts/vyos-postconfig-bootup.script
    fi
}

# execute the post-config scripts
run_postconfig_scripts ()
{
    if [ -x $vyatta_sysconfdir/config/scripts/vyatta-postconfig-bootup.script ]; then
        $vyatta_sysconfdir/config/scripts/vyatta-postconfig-bootup.script
    fi
    if [ -x $vyatta_sysconfdir/config/scripts/vyos-postconfig-bootup.script ]; then
        $vyatta_sysconfdir/config/scripts/vyos-postconfig-bootup.script
    fi
}

run_postupgrade_script ()
{
    if [ -f $vyatta_sysconfdir/config/.upgraded ]; then
        # Run the system script
        /usr/libexec/vyos/system/post-upgrade

        # Run user scripts
        if [ -d $vyatta_sysconfdir/config/scripts/post-upgrade.d ]; then
            run-parts $vyatta_sysconfdir/config/scripts/post-upgrade.d
        fi
        rm -f $vyatta_sysconfdir/config/.upgraded
    fi
}

#
# On image booted machines, we need to mount /boot from the image-specific
# boot directory so that kernel package installation will put the
# files in the right place.  We also have to mount /boot/grub from the
# system-wide grub directory so that tools that edit the grub.cfg
# file will find it in the expected location.
#
bind_mount_boot ()
{
    persist_path=$(/opt/vyatta/sbin/vyos-persistpath)
    if [ $? == 0 ]; then
        if [ -e $persist_path/boot ]; then
            image_name=$(cat /proc/cmdline | sed -e s+^.*vyos-union=/boot/++ | sed -e 's/ .*$//')

            if [ -n "$image_name" ]; then
                mount --bind $persist_path/boot/$image_name /boot
                if [ $? -ne 0 ]; then
                    echo "Couldn't bind mount /boot"
                fi

                if [ ! -d /boot/grub ]; then
                    mkdir /boot/grub
                fi

                mount --bind $persist_path/boot/grub /boot/grub
                if [ $? -ne 0 ]; then
                    echo "Couldn't bind mount /boot/grub"
                fi
            fi
        fi
    fi
}

clear_or_override_config_files ()
{
    for conf in snmp/snmpd.conf snmp/snmptrapd.conf snmp/snmp.conf \
        keepalived/keepalived.conf cron.d/vyos-crontab \
        ipvsadm.rules default/ipvsadm resolv.conf
    do
    if [ -s /etc/$conf ] ; then
        empty /etc/$conf
        chmod 0644 /etc/$conf
    fi
    done
}

update_interface_config ()
{
    if [ -d /run/udev/vyos ]; then
        $vyos_libexec_dir/vyos-interface-rescan.py $BOOTFILE
    fi
}

cleanup_post_commit_hooks () {
    # Remove links from the post-commit hooks directory.
    # note that this approach only supports hooks that are "configured",
    # i.e., it does not support hooks that need to always be present.
    cpostdir=$(cli-shell-api getPostCommitHookDir)
    # exclude commits hooks from vyatta-cfg
    excluded="10vyatta-log-commit.pl 99vyos-user-postcommit-hooks"
    if [ -d "$cpostdir" ]; then
	    for f in $cpostdir/*; do
	        if [[ ! $excluded =~ $(basename $f) ]]; then
		        rm -f $cpostdir/$(basename $f)
	        fi
	    done
    fi
}

# These are all the default security setting which are later
# overridden when configuration is read. These are the values the
# system defaults.
security_reset ()
{

    # restore NSS cofniguration back to sane system defaults
    # will be overwritten later when configuration is loaded
    cat <<EOF >/etc/nsswitch.conf
passwd:         files
group:          files
shadow:         files
gshadow:        files

# Per T2678, commenting out myhostname
hosts:          files dns #myhostname
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis
EOF

    # restore PAM back to virgin state (no radius/tacacs services)
    pam-auth-update --disable radius-mandatory radius-optional
    rm -f /etc/pam_radius_auth.conf
    pam-auth-update --disable tacplus-mandatory tacplus-optional
    rm -f /etc/tacplus_nss.conf /etc/tacplus_servers
    # and no Google authenticator for 2FA/MFA
    pam-auth-update --disable mfa-google-authenticator

    # Certain configuration files are re-generated by the configuration
    # subsystem and must reside under /etc and can not easily be moved to /run.
    # So on every boot we simply delete any remaining files and let the CLI
    # regenearte them.

    # PPPoE
    rm -f /etc/ppp/peers/pppoe* /etc/ppp/peers/wlm*

    # IPSec
    rm -rf /etc/ipsec.conf /etc/ipsec.secrets
    find /etc/swanctl -type f | xargs rm -f

    # limit cleanup
    rm -f /etc/security/limits.d/10-vyos.conf

    # iproute2 cleanup
    rm -f /etc/iproute2/rt_tables.d/vyos-*.conf

    # Container
    rm -f /etc/containers/storage.conf /etc/containers/registries.conf /etc/containers/containers.conf
    # Clean all networks and re-create them from our CLI
    rm -f /etc/containers/networks/*

    # System Options (SSH/cURL)
    rm -f /etc/ssh/ssh_config.d/*vyos*.conf
    rm -f /etc/curlrc
}

# XXX: T3885 - generate persistend DHCPv6 DUID (Type4 - UUID based)
gen_duid ()
{
    DUID_FILE="/var/lib/dhcpv6/dhcp6c_duid"
    UUID_FILE="/sys/class/dmi/id/product_uuid"
    UUID_FILE_ALT="/sys/class/dmi/id/product_serial"
    if [ ! -f ${UUID_FILE} ] && [ ! -f ${UUID_FILE_ALT} ]; then
        return 1
    fi

    # DUID is based on the BIOS/EFI UUID. We omit additional - characters
    if [ -f ${UUID_FILE} ]; then
        UUID=$(cat ${UUID_FILE} | tr -d -)
    fi
    if [ -z ${UUID} ]; then
        UUID=$(uuidgen --sha1 --namespace @dns --name $(cat ${UUID_FILE_ALT}) | tr -d -)
    fi
    # Add DUID type4 (UUID) information
    DUID_TYPE="0004"

    # The length-information (as per RFC6355 UUID is 128 bits long) is in big-endian
    # format - beware when porting to ARM64. The length field consists out of the
    # UUID (128 bit + 16 bits DUID type) resulting in hex 12.
    DUID_LEN="0012"
    if [ "$(echo -n I | od -to2 | head -n1 | cut -f2 -d" " | cut -c6 )" -eq 1 ]; then
        # true on little-endian (x86) systems
        DUID_LEN="1200"
    fi

    for i in $(echo -n ${DUID_LEN}${DUID_TYPE}${UUID} | sed 's/../& /g'); do
        echo -ne "\x$i"
    done > ${DUID_FILE}
}

start ()
{
    # reset and clean config files
    security_reset || log_failure_msg "security reset failed"

    # some legacy directories migrated over from old rl-system.init
    mkdir -p /var/run/vyatta /var/log/vyatta
    chgrp vyattacfg /var/run/vyatta /var/log/vyatta
    chmod 775 /var/run/vyatta /var/log/vyatta

    log_daemon_msg "Waiting for NICs to settle down"
    # On boot time udev migth take a long time to reorder nic's, this will ensure that
    # all udev activity is completed and all nics presented at boot-time will have their
    # final name before continuing with vyos-router initialization.
    SECONDS=0
    udevadm settle
    STATUS=$?
    log_progress_msg "settled in ${SECONDS}sec."
    log_end_msg ${STATUS}

    # mountpoint for bpf maps required by xdp
    mount -t bpf none /sys/fs/bpf

    # Clear out Debian APT source config file
    empty /etc/apt/sources.list

    # Generate DHCPv6 DUID
    gen_duid || log_failure_msg "could not generate DUID"

    # Mount a temporary filesystem for container networks.
    # Configuration should be loaded from VyOS cli.
    cni_dir="/etc/cni/net.d"
    [ ! -d ${cni_dir} ] && mkdir -p ${cni_dir}
    mount -t tmpfs none ${cni_dir}

    # Init firewall
    nfct helper add rpc inet tcp
    nfct helper add rpc inet udp
    nfct helper add tns inet tcp
    nfct helper add rpc inet6 tcp
    nfct helper add rpc inet6 udp
    nfct helper add tns inet6 tcp
    nft -f /usr/share/vyos/vyos-firewall-init.conf || log_failure_msg "could not initiate firewall rules"

    # As VyOS does not execute commands that are not present in the CLI we call
    # the script by hand to have a single source for the login banner and MOTD
    ${vyos_conf_scripts_dir}/system_console.py || log_failure_msg "could not reset serial console"
    ${vyos_conf_scripts_dir}/system_login_banner.py || log_failure_msg "could not reset motd and issue files"
    ${vyos_conf_scripts_dir}/system_option.py || log_failure_msg "could not reset system option files"
    ${vyos_conf_scripts_dir}/system_ip.py || log_failure_msg "could not reset system IPv4 options"
    ${vyos_conf_scripts_dir}/system_ipv6.py || log_failure_msg "could not reset system IPv6 options"
    ${vyos_conf_scripts_dir}/system_conntrack.py || log_failure_msg "could not reset conntrack subsystem"
    ${vyos_conf_scripts_dir}/container.py || log_failure_msg "could not reset container subsystem"

    clear_or_override_config_files || log_failure_msg "could not reset config files"

    # enable some debugging before loading the configuration
    if grep -q vyos-debug /proc/cmdline; then
        log_action_begin_msg "Enable runtime debugging options"
        touch /tmp/vyos.container.debug
        touch /tmp/vyos.ifconfig.debug
        touch /tmp/vyos.frr.debug
        touch /tmp/vyos.container.debug
    fi

    log_action_begin_msg "Mounting VyOS Config"
    # ensure the vyatta_configdir supports a large number of inodes since
    # the config hierarchy is often inode-bound (instead of size).
    # impose a minimum and then scale up dynamically with the actual size
    # of the system memory.
    local tmem=$(sed -n 's/^MemTotal: \+\([0-9]\+\) kB$/\1/p' /proc/meminfo)
    local tpages
    local tmpfs_opts="nosuid,nodev,mode=775,nr_inodes=0" #automatically allocate inodes
    mount -o $tmpfs_opts -t tmpfs none ${vyatta_configdir} \
      && chgrp ${GROUP} ${vyatta_configdir}
    log_action_end_msg $?

    # T5239: early read of system hostname as this value is read-only once during
    # FRR initialisation
    tmp=$(${vyos_libexec_dir}/read-saved-value.py --path "system host-name")
    hostnamectl set-hostname --static "$tmp"

    ${vyos_conf_scripts_dir}/system_frr.py || log_failure_msg "could not reset FRR config"
    # If for any reason FRR was not started by system_frr.py - start it anyways.
    # This is a safety net!
    systemctl start frr.service

    disabled bootfile || init_bootfile

    cleanup_post_commit_hooks

    log_daemon_msg "Starting VyOS router"
    disabled migrate || migrate_bootfile

    restore_if_missing_preconfig_script

    run_preconfig_script

    run_postupgrade_script

    update_interface_config

    for s in ${subinit[@]} ; do
    if ! disabled $s; then
        log_progress_msg $s
        if ! ${vyatta_sbindir}/${s}.init start
        then log_failure_msg
         exit 1
        fi
    fi
    done

    bind_mount_boot

    disabled configure || load_bootfile
    log_end_msg $?

    telinit q
    chmod g-w,o-w /

    restore_if_missing_postconfig_script

    run_postconfig_scripts
    tmp=$(${vyos_libexec_dir}/read-saved-value.py --path "protocols rpki cache")
    if [ ! -z $tmp ]; then
        vtysh -c "rpki start"
    fi
}

stop()
{
    local -i status=0
    log_daemon_msg "Stopping VyOS router"
    for ((i=${#sub_inits[@]} - 1; i >= 0; i--)) ; do
    s=${subinit[$i]}
    log_progress_msg $s
    ${vyatta_sbindir}/${s}.init stop
    let status\|=$?
    done
    log_end_msg $status
    log_action_begin_msg "Un-mounting VyOS Config"
    umount ${vyatta_configdir}
    log_action_end_msg $?

    systemctl stop frr.service
}

case "$action" in
    start) start ;;
    stop)  stop ;;
    restart|force-reload) stop && start ;;
    *)  log_failure_msg "usage: $progname [ start|stop|restart ] [ subinit ... ]" ;
    false ;;
esac

exit $?

# Local Variables:
# mode: shell-script
# sh-indentation: 4
# End: